3.11.1 Splitter (Breakout) Cables and Adapters
A 100GbE port can be split to two 50GbE ports, or to four (or less) 25GbE ports, using a Mellanox splitter cable.
Splitting a 100GbE QSFP28 port to 4 separate 25GbE ports (using a splitter cable) disables (unmaps) the 100GbE port below it. See
“SN2700 and SN2740 Splitting Options” below.
3.11.1.1 Using Splitter (Breakout) Cables with Mellanox Onyx (MLNX-OS)
When using this feature, you should log into the Mellanox Onyx (MLNX-OS) CLI and configure the individual ports to be ‘split-2’ or
‘split-4’. For further information on Mellanox’s cable, visit http://www.mellanox.com/page/interconnect_overview.
3.11.1.2 Using Splitter (Breakout) Cables with Cumulus Linux
If you are using 4x10G direct attach copper cables or active optical cables, edit the /etc/cumulus/ports.conf to enable support for these
cables, then restart the switchd service using the sudo systemctl restart switchd command. For more details, see Layer 1 and Switch
Port Attributes in the Cumulus Linux User Guide.
Examples of Splitter (Breakout or Fanout) Cables
3.11.1.3 SN2700 and SN2740 Splitting Options
The top QSFP28 ports marked in green are splittable to 4 SFP28 ports, each.
The bottom QSFP28 ports (gray) are blocked when the upper ports are in split mode.
All QSFP28 ports can be split to 2 QSFP28 ports.
The SN2410 system includes ports of different types. The figure above does not apply to the SFP28 ports; see "SN2410
Splitting Options" below.
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